270 



CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Florida: Jacksonville, Curtiss 21, 3602*, 5588, Kearney 145; Baldwin, Hitch- 

 cock 985; Lake City, Combs 127, Hitchcock 1027, 1037; Carabelle, Kearney 

 92; Dunedin, Tracy 6726; St. Augustine, Canby in 1869; Indian River, 

 Palmer 634 in 1874 in part; Melbourne, Curtiss 5804; Titusville, Chase 3965, 

 Hitchcock 759; Jensen, Hitchcock 729; Sanford, Ctae 4032, 4036, 4037, Hitch- 

 cock 769, 778, 781, 828; Eustis, Chase 4053, Hitchcock 794, 806, 807, 818, 

 JVasA 51, 71, 335, 778, 1238; Oakland, Curtiss 6628; Lemon Bay, Tracy 7191, 

 7200; Tampa, Combs 1344, Hitchcock 928, 934, 944; Braidentown, Hitch- 

 cock 951, 952, 954, 973, Tracy 6732; Manatee, Hitchcock 975, Pu^eZ 377; Myers, 

 Chase 4153, 4156, 4171, Hitchcock 865, 866, 873, 885, 887, 895, 916, 924, Lee 

 Co. PL 472; Sneeds Island, Tracy 6451, 6464, 6693; Perdido, Tracy 8407. 



Alabama: Fort Morgan, Tracy 7207. 



Mississippi: Avondale, Tracy 4610; Mississippi City, Hitchcock 1114. 

 In the herbarium of the Philadelphia Academy is a specimen said to be from 

 Surinam which appears to be P. chamaelonche. 



161. Panicum glabrifolium Nash. 



Panicum glabrifolium Nash, Bull. Torrey Club 24 : 196. 1897. " Collected by the 

 writer in the 'flatwoods' at Tampa, Florida, on August 20, 1895, no. 2415a." The 

 type, in Nash's herbarium, is the early branching state. The spikelets are 1.25 mm. 

 long. The statement in the original description, "the spike- 

 lets slightly exceeding .5 mm. in length" is doubtless a typo- 

 graphical error. 



DESCRIPTION. 



Vernal form similar to that of P. chamaelonche, in smaller 



tt onn 75 7 %. v 7- tufts; culms stouter, more or less flattened, 15 to 50 cm. high, 



Fig. 299.— P. glabrifolium. ' . ' . ' & ' 



From type specimen. erect or sometimes subgeniculate at base; blades firm, erect, 

 or narrowly ascending 4 to 12 cm. long, or the lower occasion- 

 ally as much as 20 cm. long, 2 to 4 mm. wide, usually involute at least toward the apex, 

 glabrous; panicles 4 to 9 cm. long, two-thirds to three-fourths as wide, the branches 

 ascending, the ultimate branchlets and spikelets more or less secund along the lower 

 side of the branches; spikelets 1.2 to 1.4 mm. long, obovate, obtuse, turgid, glabrous; 

 first glume about one-third as long as the spikelet; second glume shorter than the fruit 

 and sterile lemma; fruit 1.1 to 1.2 mm. long, elliptic. 



Autumnal culms wiry, elongated, and spreading, with geniculate nodes and long 

 internodes; freely branching from the middle and upper nodes, the blades long and 

 narrow, overtopping the somewhat reduced panicles; winter leaves less numerous than 

 in P. chamaelonche, as much as 10 to 15 cm. long, stiffly ascending. 



In the vernal form this species is distinguished from P. chamaelonche by the taller, 

 stouter culms, more involute blades, larger panicles, and slightly larger spikelets. The 

 autumnal form is distinguished by the 

 different branching habit. There are, 

 however, intermediate specimens that 

 appear to connect the two species, such 

 as Hitchcock 893, from Myers, which has 

 the tall culms, elongated lower blades 

 and large panicles of P. glabrifoliumbut 

 the smaller spikelets of P. chamaelonche. 



DISTRIBUTION. 



Low sandy woods, peninsular Florida. 



Florida: Crystal, Combs 1024; 



Braidentown, Combs 1313, 



Fig. 300.— Distribution of P. glabrifolium. 



1316, Hitchcock 966, Tracy 6715; Manatee, Hitchcock 978, Simpson in 1889; 

 Cedar Key, Combs 780; Bartow, Combs 1187. 



